Intramolecular Transmetalation of Arylpalladium(II) and Arylplatinum(II) Complexes with Silanes and Stannanes
作者:Cristina Mateo、Carolina Fernández-Rivas、Diego J. Cárdenas、Antonio M. Echavarren
DOI:10.1021/om980157o
日期:1998.8.1
palladium(0) complexes [Pd(PPh3)], [Pd(dba)(AsPh3)2] (dba = dibenzylideneacetone), and [Pd(dba)(L2)] [L2 = 1,1‘-bis(diphenylphosphino)ferrocene (dppf), 2,2‘-bipyridine (bpy), o-phenanthroline (phen)] leads to the corresponding complexes o-(Me2RCH2O)C6H4Pd(L2)I (L = PPh3, AsPh3; L2 = dppf, bpy, phen). This Pd(II)/Si transmetalation, the key step in the Hiyama cross-coupling reaction, proceeds smoothly
o-(Me 2 RSiCH 2 O)C 6 H 4 I(R = Me,Ph,F)的氧化加成至钯(0)络合物[Pd(PPh 3)],[Pd(dba)(AsPh 3)2 ](dba =二亚苄基丙酮)和[Pd(dba)(L 2)] [L 2 = 1,1'-双(二苯基膦基)二茂铁(dppf),2,2'-联吡啶(bpy),邻-邻菲咯啉(phen)]生成相应的络合物o-(Me 2 RCH 2 O)C 6 H 4 Pd(L 2)I(L = PPh 3,AsPh 3 ; L2 = dppf,bpy,phen)。这种Pd(II)/ Si过渡金属化是Hiyama交叉偶联反应的关键步骤,可在不同的氟化物作为促进剂的情况下平稳地进行。另外,碳酸银和碳酸钾可能通过形成具有Pd-O键的中间体来促进金属转移。相关的Pt(II)/ Sn和Pt(II)/ Si过渡金属化导致形成稳定的氧杂铂环。与Pd(II)/ Si过渡金属